CN114659238B - Air conditioning system and low-temperature starting control method thereof - Google Patents
Air conditioning system and low-temperature starting control method thereof Download PDFInfo
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- CN114659238B CN114659238B CN202210243267.8A CN202210243267A CN114659238B CN 114659238 B CN114659238 B CN 114659238B CN 202210243267 A CN202210243267 A CN 202210243267A CN 114659238 B CN114659238 B CN 114659238B
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- compressor
- air conditioning
- conditioning system
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- 238000004378 air conditioning Methods 0.000 title claims abstract description 52
- 238000000034 method Methods 0.000 title claims abstract description 17
- 239000007788 liquid Substances 0.000 claims abstract description 47
- 239000003507 refrigerant Substances 0.000 claims description 38
- 230000000903 blocking effect Effects 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 8
- 238000005057 refrigeration Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 3
- 238000001035 drying Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000011521 glass Substances 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
- F24F11/48—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring prior to normal operation, e.g. pre-heating or pre-cooling
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/89—Arrangement or mounting of control or safety devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/40—Fluid line arrangements
- F25B41/42—Arrangements for diverging or converging flows, e.g. branch lines or junctions
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B43/00—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat
- F25B43/003—Filters
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B43/00—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat
- F25B43/006—Accumulators
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
Abstract
The application discloses an air conditioning system and a low-temperature starting control method thereof, wherein the air conditioning system comprises a compressor, a condenser, a liquid reservoir, an expansion valve, an evaporator, a connecting pipeline, an electromagnetic valve and the connecting pipeline arranged between the condenser and the liquid reservoir; a pressure sensor provided in the connection line between the compressor and the condenser and detecting a discharge pressure of the compressor; and the controller is connected with the pressure sensor and the electromagnetic valve, so as to control the electromagnetic valve to be conducted when the exhaust pressure detected by the pressure sensor is larger than the preset pressure, and to control the electromagnetic valve to be closed when the exhaust pressure detected by the pressure sensor is smaller than the preset pressure. The air conditioning system provided by the application can quickly establish the pressure difference required by normal operation of the compressor when the low-temperature environment is started, and ensure safe and stable operation of the compressor and the air conditioning system.
Description
Technical Field
The present disclosure relates to air conditioning, and more particularly, to an air conditioning system and a low temperature start control method for the air conditioning system.
Background
The data machine room equipment has stable heat dissipation throughout the year and good sealing and heat insulation, so that the air conditioner is required to perform refrigeration operation even in cold winter. In some low latitude areas, when the outdoor environment temperature is lower than-15 ℃, if the pressure difference required by the normal operation of the compressor is built without technical means, the air conditioner cannot perform refrigeration operation in a low temperature environment. In order to solve the difficult problem of refrigerating operation of an air conditioner in a low-temperature environment, the prior art is to add a low-temperature option, the method has the problem that the time required for establishing a pressure difference is long, particularly a variable-frequency air conditioning system, the pressure difference is established for a longer time, and the risk of damage to a compressor is increased.
Disclosure of Invention
The purpose of this application is to provide an air conditioning system, and this air conditioning system can establish the required pressure differential of compressor normal operating fast when low temperature environment starts, guarantee the safe and stable operation of compressor and air conditioning system. Another object of the present application is to provide a low-temperature start control method of an air conditioning system applied to the air conditioning system.
To achieve the above object, the present application provides an air conditioning system, including a compressor, a condenser, a liquid storage, an expansion valve, an evaporator, and a connection pipe, further including:
the electromagnetic valve is arranged on the connecting pipeline between the condenser and the liquid storage device;
a pressure sensor provided in the connection line between the compressor and the condenser and detecting a discharge pressure of the compressor;
and the controller is connected with the pressure sensor and the electromagnetic valve, so as to control the electromagnetic valve to be conducted when the exhaust pressure detected by the pressure sensor is larger than the preset pressure, and to control the electromagnetic valve to be closed when the exhaust pressure detected by the pressure sensor is smaller than the preset pressure.
Optionally, the connecting pipeline at the inlet of the liquid storage device is provided with a one-way valve.
Optionally, the system further comprises a refrigerant bypass, one end of the refrigerant bypass is connected to the connecting pipeline between the compressor and the condenser, the other end of the refrigerant bypass is connected to the connecting pipeline between the electromagnetic valve and the liquid storage device, and the refrigerant bypass is provided with a differential pressure control valve which is conducted when the differential pressure of the two ends of the differential pressure control valve is larger than a preset value.
Optionally, the differential pressure control valve is a self-operated differential pressure control valve.
Optionally, the connecting pipeline between the liquid storage device and the expansion valve is provided with a drying filter and a liquid viewing mirror.
Optionally, the connecting pipeline of the evaporator inlet is provided with a liquid separator.
Optionally, the condenser also comprises a temperature sensor for detecting the temperature of the environment where the condenser is located, and the temperature sensor is connected with the controller.
The application also provides a low-temperature starting control method of the air conditioning system, which comprises the following steps:
detecting the discharge pressure of the compressor;
if the exhaust pressure is greater than the preset pressure, the condenser is controlled to be communicated with the liquid reservoir;
and if the exhaust pressure is smaller than the preset pressure, cutting off the connection between the condenser and the liquid storage device, blocking the refrigerant in the condenser, and returning to the step of detecting the exhaust pressure of the compressor.
Optionally, the step of "cutting off the connection between the condenser and the liquid reservoir and blocking the refrigerant in the condenser" includes:
and a solenoid valve is arranged between the outlet of the condenser and the inlet of the liquid storage device, and the solenoid valve is closed.
Optionally, detecting a pressure difference between the condenser inlet and the accumulator inlet, and bypassing a portion of the refrigerant into the accumulator when the pressure difference is greater than a preset value.
Optionally, the step of bypassing part of the refrigerant into the accumulator includes: and a refrigerant bypass is connected between the condenser inlet and the liquid storage inlet, and a differential pressure control valve is arranged, and when the differential pressure at the two ends of the differential pressure control valve is larger than a preset value, the differential pressure control valve is conducted.
The air conditioning system provided by the application can realize normal and quick start in an outdoor-35 ℃ environment, and shortens the time for establishing the required pressure difference of the compressor. When the air conditioning system is started at low temperature, the outdoor environment is too low, the heat exchange effect of the condenser is good, the exhaust pressure of the compressor is difficult to quickly build in a short time, and the normal operation of the compressor is influenced. The application detects the exhaust pressure of the compressor by means of the pressure sensor and feeds back the exhaust pressure to the controller, when the exhaust pressure is lower than the preset pressure, the controller controls the electromagnetic valve to disconnect the connection between the liquid storage device and the condenser, the refrigerant is blocked in the condenser, the heat exchange effect of the condenser is reduced, the pressure difference required by normal operation of the compressor is built in a short time, and the stable and safe operation of the compressor and an air conditioning system is ensured, so that the service life is prolonged.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present application, and that other drawings may be obtained according to the provided drawings without inventive effort to a person skilled in the art.
Fig. 1 is a system diagram of an air conditioning system according to a first embodiment of the present application;
fig. 2 is a system diagram of an air conditioning system according to a second embodiment of the present application;
fig. 3 is a system diagram of an air conditioning system according to a third embodiment of the present application;
fig. 4 is a system diagram of an air conditioning system according to a fourth embodiment of the present application;
fig. 5 is a flowchart of a low-temperature start control method of an air conditioning system according to an embodiment of the present application.
Wherein:
1-compressor, 2-pressure sensor, 3-condenser, 4-differential pressure control valve, 5-temperature sensor, 6-controller, 7-solenoid valve, 8-check valve, 9-reservoir, 10-drier-filter, 11-sight glass, 12-expansion valve, 13-knockout, 14-evaporator, 15-second pressure sensor.
Detailed Description
The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.
In order to better understand the aspects of the present application, a further detailed description of the present application will be provided below with reference to the accompanying drawings and detailed description.
Referring to fig. 1 to 5, fig. 1 is a system diagram of an air conditioning system according to a first embodiment of the present application, fig. 2 is a system diagram of an air conditioning system according to a second embodiment of the present application, fig. 3 is a system diagram of an air conditioning system according to a third embodiment of the present application, fig. 4 is a system diagram of an air conditioning system according to a fourth embodiment of the present application, and fig. 5 is a flowchart of a low-temperature start control method of an air conditioning system according to an embodiment of the present application.
The air conditioning system provided by the application is the same as a conventional air conditioning system, and comprises a compressor 1, a condenser 3, a liquid storage 9, an expansion valve 12, an evaporator 14 and connecting pipelines for connecting the components in sequence; differently, the air conditioning system provided by the application further comprises an electromagnetic valve 7, a pressure sensor 2 and a controller 6, the pressure sensor 2 is used for detecting the exhaust pressure of the compressor 1 when the air conditioning system is started, the electromagnetic valve 7 is controlled to be closed by the controller 6 when the exhaust pressure is lower than the preset pressure, the pressure at the exhaust port of the compressor 1 is improved, the pressure difference required by the operation of the compressor 1 is assisted to be quickly established, and the stable operation of the air conditioning system is ensured.
In one embodiment provided in the present application, as shown in fig. 1, an air conditioning system includes a compressor 1, a condenser 3, a liquid reservoir 9, an expansion valve 12, an evaporator 14, a connection pipe, a pressure sensor 2, a solenoid valve 7, and a controller 6, where in this embodiment, the solenoid valve 7 is an on-off control valve; the air suction port of the compressor 1 is connected with the evaporator 14 through a connecting pipeline, the air discharge port of the compressor 1 is connected with the condenser 3 through a connecting pipeline, and the condenser 3 is sequentially connected with the expansion valve 12 and the evaporator 14 through the connecting pipeline; the pressure sensor 2 is connected to the connecting pipeline between the exhaust port of the compressor 1 and the condenser 3, so that the exhaust pressure of the compressor 1 can be detected in real time, the electromagnetic valve 7 is arranged on the connecting pipeline between the outlet of the condenser 3 and the liquid storage 9, the on-off of the connecting pipeline between the condenser 3 and the liquid storage 9 can be controlled, and the electromagnetic valve 7 and the pressure sensor 2 are connected to the controller 6, so that the controller 6 controls the electromagnetic valve 7 to be closed when the exhaust pressure detected by the pressure sensor 2 is lower than the preset pressure, the refrigerant in the condenser 3 is prevented from flowing to the liquid storage 9, the pressure at the exhaust port of the compressor 1 is increased, and the pressure difference required by the operation of the compressor 1 is assisted to be quickly established. When the exhaust pressure detected by the pressure sensor 2 is greater than the preset pressure, the controller 6 controls the electromagnetic valve 7 to be conducted, the pressure difference of the compressor 1 meets the operation requirement, and the refrigerant can circulate in the air conditioning system.
In the above embodiment, the inlet of the liquid storage 9 is further provided with the one-way valve 8, and the arrangement of the one-way valve 8 prevents the refrigerant in the liquid storage 9 from flowing back, so as to ensure that the refrigerant in the liquid storage 9 flows to the evaporator 14 and the compressor 1 in one direction, and ensure the suction pressure of the compressor 1. The connecting pipeline between the liquid storage 9 and the expansion valve 12 is provided with a drying filter 10 and a liquid viewing mirror 11 according to the requirement, and the connecting pipeline at the inlet of the evaporator 14 is provided with a liquid distributor 13, so that the refrigerant is uniformly evaporated in the evaporator 14.
In an embodiment, referring to fig. 2, to ensure the suction pressure of the compressor 1, the present application further provides a refrigerant bypass, one end of which is connected to the connecting line between the discharge port of the compressor 1 and the condenser 3, and the other end of which is connected to the connecting line between the solenoid valve 7 and the accumulator 9. Therefore, when the pressure difference of the two ends of the pressure difference control valve 4 is larger than a preset value, namely when the pressure of the liquid reservoir 9 is too low, the pressure difference control valve 4 is conducted, and refrigerant at the inlet of the condenser 3 can be led into the liquid reservoir 9 through a refrigerant bypass, so that the refrigerant flow of the liquid reservoir 9 to the evaporator 14 and the suction pressure of the compressor 1 are ensured. In the present embodiment, the differential pressure control valve 4 is preferably a self-operated differential pressure control valve, and can be automatically opened when the differential pressure between both ends is larger than a set value.
Referring to fig. 3, in order to shorten the time for the compressor 1 to establish the pressure difference, the present application further provides a temperature sensor 5 for detecting the ambient temperature of the condenser 3, the temperature sensor 5 is connected to a controller 6, and before the compressor 1 is started, when the temperature sensor 5 detects that the ambient temperature is lower than a set temperature, such as-15 ℃, the controller 6 controls the electromagnetic valve 7 to close in advance; after the compressor 1 is started, the controller 6 controls the control logic of the electromagnetic valve 7 to be released based on the temperature sensor 5, and the controller 6 controls the electromagnetic valve 7 to be turned on or off based on the pressure control logic of the pressure sensor 2.
In addition, in an embodiment, referring to fig. 4, the differential pressure control valve 4 may also be driven by an external force, where the controller 6 needs to receive the differential pressure signal of the two ends of the refrigerant bypass in real time and control the driving mechanism of the differential pressure control valve 4 to conduct the differential pressure control valve 4 according to the differential pressure signal; the second pressure sensor 15 may be disposed in the liquid storage 9, where the second pressure sensor 15 is connected to the controller 6, and the controller controls the differential pressure control valve 4 to open the refrigerant bypass when the differential pressure is greater than a set value based on the differential pressures detected by the pressure sensor 2 and the second pressure sensor 15.
The embodiment of the application also provides a low-temperature starting control method of the air conditioning system, as shown in fig. 5, including:
step S10, detecting the exhaust pressure of the compressor 1, and detecting the exhaust pressure of the compressor 1 at the initial stage of starting operation of the compressor 1 in order to ensure stable operation of the compressor 1; specifically, a pressure sensor 2 is provided in a connection line between an exhaust port of the compressor 1 and an intake port of the condenser 3, and the exhaust pressure is detected by the pressure sensor 2;
step S20, determining whether the exhaust pressure is greater than a preset pressure, feeding the exhaust pressure detected by the sensor back to the controller 6 connected to the sensor, and comparing the exhaust pressure with a preset pressure stored in the controller 6, so as to determine a relationship between the exhaust pressure and the preset pressure, so as to adjust the operation of the air conditioning system according to the relationship between the exhaust pressure and the preset pressure, and help the compressor 1 to rapidly decompress the pressure difference required for operation.
In step S21, if the discharge pressure is greater than the preset pressure, the condenser 3 is controlled to be connected to the liquid storage device 9, and the discharge pressure is greater than the preset pressure, which indicates that the current suction-discharge pressure difference of the compressor 1 is within the range allowing the compressor 1 to safely and stably operate, at this time, the air conditioning system is not required to be adjusted, and the air conditioning system can be started to operate according to the normal refrigeration mode for performing refrigeration cycle.
Step S22, if the exhaust pressure is smaller than the preset pressure, the connection between the condenser 3 and the liquid reservoir 9 is cut off, and the refrigerant is blocked in the condenser 3; if the discharge pressure is smaller than the preset pressure, the current discharge pressure of the compressor 1 is too low, and the suction-discharge pressure difference does not meet the stable operation of the compressor 1; at this time, the operation of the air conditioning system needs to be interfered, so as to help the compressor 1 to establish the pressure difference required by the operation as soon as possible, and the main adjustment mode is that the electromagnetic valve 7 is arranged on the connecting pipeline between the liquid storage 9 and the condenser 3, the electromagnetic valve 7 is turned off, the refrigerant is blocked in the condenser 3, the heat exchange effect of the condenser 3 is reduced, the pressure at the exhaust port of the compressor 1 is increased, and then the step S10 is returned until the pressure difference required by the operation of the compressor 1 is quickly established, and then the electromagnetic valve 7 is turned on to perform normal refrigeration circulation.
In an embodiment, the method for controlling low-temperature start of an air conditioning system further includes detecting a pressure difference between the condenser 3 and the liquid reservoir 9, when the pressure difference between the inlet of the condenser 3 and the inlet of the liquid reservoir 9 is greater than a set value, the pressure in the liquid reservoir 9 is indicated to be too low, a large amount of refrigerant in the system is concentrated in the condenser 3, the amount of refrigerant in the liquid reservoir 9 is insufficient, at this time, part of refrigerant at the air outlet of the compressor 1 needs to be conveyed to the liquid reservoir 9, and the pressure of the liquid reservoir 9 is raised, so that the pressure at the air suction inlet of the compressor 1 is ensured. In this embodiment, a refrigerant bypass is provided to communicate the inlet of the condenser 3 with the inlet of the accumulator 9, and a differential pressure control valve 4 is provided to the refrigerant bypass. When the pressure difference of the two ends of the pressure difference control valve 4 is larger than a preset value, the pressure difference control valve 4 is conducted, so that partial refrigerant at the exhaust port of the compressor 1 is bypassed into the liquid reservoir 9, and the pressure of the liquid reservoir 9 is increased.
It should be noted that in this specification relational terms such as first and second are used solely to distinguish one entity from another entity without necessarily requiring or implying any actual such relationship or order between such entities.
The air conditioning system and the low-temperature starting control method of the air conditioning system provided by the application are described in detail above. Specific examples are set forth herein to illustrate the principles and embodiments of the present application, and the description of the examples above is only intended to assist in understanding the methods of the present application and their core ideas. It should be noted that it would be obvious to those skilled in the art that various improvements and modifications can be made to the present application without departing from the principles of the present application, and such improvements and modifications fall within the scope of the claims of the present application.
Claims (9)
1. An air conditioning system, includes compressor, condenser, reservoir, expansion valve, evaporimeter and connecting line, its characterized in that still includes:
the electromagnetic valve is arranged on the connecting pipeline between the condenser and the liquid storage device;
a pressure sensor provided in the connection line between the compressor and the condenser and detecting a discharge pressure of the compressor;
the controller is connected with the pressure sensor and the electromagnetic valve to control the electromagnetic valve to be conducted when the exhaust pressure detected by the pressure sensor is larger than the preset pressure, and to control the electromagnetic valve to be closed when the exhaust pressure detected by the pressure sensor is smaller than the preset pressure so as to block the refrigerant in the condenser;
the temperature sensor is used for detecting the ambient temperature of the condenser and is connected with the controller; before the compressor is started, when the temperature sensor detects that the ambient temperature is lower than a set temperature, the controller controls the electromagnetic valve to be closed in advance; after the compressor is started, the controller controls the control logic of the electromagnetic valve to be released based on the temperature sensor, and controls the electromagnetic valve to be turned on or turned off based on the pressure control logic of the pressure sensor.
2. An air conditioning system according to claim 1, wherein the connecting line at the inlet of the reservoir is provided with a one-way valve.
3. An air conditioning system according to claim 1 or 2, further comprising a refrigerant bypass having one end connected to the connection line between the compressor and the condenser and the other end connected to the connection line between the solenoid valve and the accumulator, the refrigerant bypass being provided with a differential pressure control valve that is turned on when a differential pressure across the refrigerant bypass is greater than a preset value.
4. An air conditioning system according to claim 3, wherein the differential pressure control valve is a self-actuated differential pressure control valve.
5. An air conditioning system according to claim 3, wherein the connecting line between the reservoir and the expansion valve is provided with a drier filter and a liquid viewing mirror, and the connecting line of the evaporator inlet is provided with a liquid separator.
6. A low-temperature start control method of an air conditioning system, characterized by being applied to the air conditioning system according to any one of claims 1 to 5, comprising:
detecting the discharge pressure of the compressor;
if the exhaust pressure is greater than the preset pressure, controlling the compressor to be communicated with the condenser;
if the exhaust pressure is smaller than the preset pressure, cutting off the connection between the condenser and the liquid reservoir, blocking the refrigerant in the condenser, and returning to the step of detecting the exhaust pressure of the compressor;
the controller is used for controlling the electromagnetic valve to be closed in advance when the temperature sensor detects that the ambient temperature of the condenser is lower than the set temperature before the compressor is started; after the compressor is started, the controller controls the control logic of the electromagnetic valve to be released based on the temperature sensor, and controls the electromagnetic valve to be turned on or turned off based on the pressure control logic of the pressure sensor; the temperature sensor is connected with the controller.
7. The method of claim 6, wherein the step of cutting off the connection between the condenser and the accumulator to block the refrigerant in the condenser comprises the steps of:
and a solenoid valve is arranged between the outlet of the condenser and the inlet of the liquid storage device, and the solenoid valve is closed.
8. The method according to claim 6 or 7, further comprising detecting a pressure difference between the condenser inlet and the accumulator inlet, and bypassing a portion of the refrigerant into the accumulator when the pressure difference is greater than a preset value.
9. The method of claim 8, wherein the step of bypassing the portion of the refrigerant into the accumulator is: and a refrigerant bypass is connected between the condenser inlet and the liquid storage inlet, and a differential pressure control valve is arranged, and when the differential pressure at the two ends of the differential pressure control valve is larger than a preset value, the differential pressure control valve is conducted.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210243267.8A CN114659238B (en) | 2022-03-11 | 2022-03-11 | Air conditioning system and low-temperature starting control method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210243267.8A CN114659238B (en) | 2022-03-11 | 2022-03-11 | Air conditioning system and low-temperature starting control method thereof |
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| CN114659238A CN114659238A (en) | 2022-06-24 |
| CN114659238B true CN114659238B (en) | 2024-04-02 |
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